Photolabile pro-fragrances

ABSTRACT

Fragrances having a fresh character are usually very volatile and therefore not very economical in typical applications such as washing or cleaning processes for example. For that reason they have to be used in relatively large amounts in order to bring about appropriate effects. The present invention describes photolabile pro-fragrances of formula (I) that allow for a greatly improved persistence of the fragrance impression, in particular one having a fresh character, in typical applications. Said pro-fragrances attach very readily to target substrates, such as textiles for example. A more economical use of the fragrances in question can be ensured in this way.

CROSS-REFERENCE TO RELATED APPLICATION

This application is a divisional of U.S. application Ser. No. 14/140,608, filed on Dec. 26, 2013, entitled “PHOTOLABILE PRO-FRAGRANCES” which is a continuation of International Patent Application No. PCT/EP2012/060472, filed Jun. 4, 2012 and entitled “PHOTOLABILE PRO-FRAGRANCES”, which claims priority to DE 10 2011 078 415.2, filed Jun. 30, 2011, by which all are hereby incorporated by reference in their entirety.

FIELD OF THE INVENTION

The present invention generally relates to the field of pro-fragrances. It relates to special ketones that function as photolabile pro-fragrances. The present invention also relates to washing or cleaning agents and cosmetic agents comprising such ketones. It also relates to a method for the lasting fragrancing of surfaces.

BACKGROUND OF THE INVENTION

Washing or cleaning agents and cosmetic agents mostly contain fragrances which impart a pleasant odor to the agents. The fragrances mostly mask the odor of the other ingredients, creating a pleasant odor impression for the user.

In the washing agents sector in particular, fragrances are important constituents of the composition, since in both the wet and the dry state the laundry should have a pleasant and where possible also a fresh scent. The fundamental problem underlying the use of fragrances is that they are more or less highly volatile compounds, yet a lasting fragrance effect is desired. In the case in particular of fragrances which provide the fresh and light notes of the perfume and which because of their high vapor pressure evaporate particularly quickly, the desired persistence of the fragrance impression is very difficult to achieve.

A delayed fragrance release can occur through for example the carrier-bound use of fragrances. A carrier-bound precursor form of a fragrance is also known as a pro-fragrance or fragrance storage substance. In this context international patent application WO2007/087977 discloses the use of 1-aza-3,7-dioxabicyclo[3.3.0]octane compounds as pro-fragrances for the delayed release of fragrance aldehydes and fragrance ketones by hydrolysis. An alternative possibility for the delayed release of fragrances is the use of photoactivatable substances as pro-fragrances. Exposure to sunlight or to another electromagnetic radiation source of a certain wavelength induces the breakage of a covalent bond in the pro-fragrance molecule, causing a fragrance to be released.

U.S. Pat. No. 6,949,680 discloses the use of certain phenyl or pyridyl ketones as photoactivatable substances which in the presence of light in a photochemical fragmentation release a terminal alkene as an active substance. Said active substance has for example a fragrance-imparting or antimicrobial activity, which is first delayed by the photochemically induced decomposition and is released over an extended period on a specific surface.

WO2009/118219 A1 describes certain ketones as photoactivatable substances which allow the delayed release of cyclic compounds having at least one cyclic double bond, in particular cyclic terpenes or cyclic terpenoids having at least one cyclic double bond.

WO2010/066486 A2 describes certain beta-hydroxyketones as photoactivatable substances which in the presence of light allow for a release of fragrance aldehydes (perfume aldehydes) and fragrance ketones (perfume ketones).

The object of the present invention was to provide further photoactivatable substances as pro-fragrances which allow for the delayed release of perfume ketones, in particular of damascone.

Furthermore, other desirable features and characteristics of the present invention will become apparent from the subsequent detailed description of the invention and the appended claims, taken in conjunction with the accompanying drawings and this background of the invention.

BRIEF SUMMARY OF THE INVENTION

A ketone of the general formula (I),

Wherein R denotes a substituted hydrocarbon residue having at least one C═O group; R1, R2 each independently of one another denote hydrogen, an aryl residue, a linear or branched, substituted or unsubstituted alkoxy group having 1 to 15 C atoms, a linear or branched, substituted or unsubstituted alkyl group having 1 to 15 C atoms or a substituted or unsubstituted aryl residue; R3, R4, R5, R6 and R7 each independently of one another denote hydrogen, an amino group, —NO2, a linear or branched, substituted or unsubstituted alkoxy group having 1 to 15 C atoms, a linear or branched, substituted or unsubstituted alkyl group having 1 to 15 C atoms, a cycloalkyl residue, acyl residue, aryl residue, —OH, —NH₂, halogen, NH alkyl or —N(alkyl)₂; and wherein at least one of the residues R3, R4, R5, R6, R7 denotes a —CO—X group, where X═H, alkyl, cycloalkyl, aryl, acyl, —OH, —Oalkyl, NH₂, NH-alkyl, —N(alkyl)₂ or halogen.

DETAILED DESCRIPTION OF THE INVENTION

The following detailed description of the invention is merely exemplary in nature and is not intended to limit the invention or the application and uses of the invention. Furthermore, there is no intention to be bound by any theory presented in the preceding background of the invention or the following detailed description of the invention.

This object of the present invention was achieved by a ketone of the general formula (I),

wherein the residue R denotes a substituted hydrocarbon residue having at least one C═O group, R1, R2 each independently of one another denote hydrogen, an aryl residue, a linear or branched, substituted or unsubstituted alkoxy group having 1 to 15 C atoms, a linear or branched, substituted or unsubstituted alkyl group having 1 to 15 C atoms or a substituted or unsubstituted aryl residue, R3, R4, R5, R6 and R7 each independently of one another denote hydrogen, an amino group, —NO2, a linear or branched, substituted or unsubstituted alkoxy group having 1 to 15 C atoms, a linear or branched, substituted or unsubstituted alkyl group having 1 to 15 C atoms, a cycloalkyl residue, acyl residue, aryl residue, —OH, —NH₂, halogen, NH alkyl or —N(alkyl)₂, and wherein at least one of the residues R3, R4, R5, R6, R7 denotes a —CO—X group, where X═H, alkyl, cycloalkyl, aryl, acyl, —OH, —Oalkyl, NH₂, NH-alkyl, —N(alkyl)₂ or halogen.

The residue R, which denotes a substituted hydrocarbon residue having at least one C═O group, can be linear or branched and in particular it can also encompass at least one ring system.

The ketones according to the invention are particularly effective pro-fragrances, which allow for the delayed release of perfume ketones, in particular of damascone. The use of the ketones according to the invention in washing, cleaning or care agents leads in the use thereof to an improved long-term fragrance effect in the treated substrates, in particular in connection with the treatment of textiles. Thus when ketones according to the invention were used in a laundry treatment agent such as for example a washing agent or fabric softener, an improved long-term fragrance effect in the treated laundry was found.

Regarding their use in washing or cleaning agents, the pro-fragrances according to the invention enable the total amount of perfume contained in the agent to be reduced while nevertheless achieving olfactory benefits in the laundered textiles, in particular with regard to the perception of freshness.

A particular advantage of the present invention is that the ketones according to the invention exhibit outstanding attachment characteristics to the target substrates during use, i.e. the pro-fragrances attach particularly efficiently to the target substrates, in particular to textiles. Thus the ratio of the amount of pro-fragrance used to the amount of pro-fragrance deposited on the target substrate is very favorable. This allows for a particularly economical use of the pro-fragrances according to the invention when used in washing or cleaning agents for example. Washing or cleaning agents comprising the pro-fragrances according to the invention also have a particularly good storage stability.

The ketone according to the invention of the general formula (I) is suitable as a pro-fragrance for all conventional fragrance ketones, selected in particular from Buccoxime; isojasmone; methyl-beta-naphthyl ketone; musk indanone; Tonalide/Musk plus; alpha-damascone, beta-damascone, delta-damascone, gamma-damascone, damascenone, damarose, methyl dihydrojasmonate, menthone, carvone, camphor, fenchone, alpha-ionone, beta-ionone, gamma-methyl ionone, fleuramone, dihydrojasmone, cis-jasmone, iso-E-Super®, methyl cedrenyl ketone or methyl cedrylone, acetophenone, methyl acetophenone, para-methoxyacetophenone, methyl-beta-naphthyl ketone, benzyl acetone, benzophenone, para-hydroxyphenyl butanone, celery ketone or livescone, 6-isopropyl decahydro-2-naphthone, dimethyl octenone, frescomenthe, 4-(1-ethoxyvinyl)-3,3,5,5-tetramethylcyclohexanone, methyl heptenone, 2-(2-(4-methyl-3-cyclohexen-1-yl)propyl)cyclopentanone, 1-(p-menthen-6(2)yl)-1-propanone, 4-(4-hydroxy-3-methoxyphenyl)-2-butanone, 2-acetyl-3,3-dimethyl norbornane, 6,7-dihydro-1,1,2,3,3-pentamethyl-4(5H)indanone, 4-damascol, dulcinyl or cassione, gelsone, hexalon, isocyclemone E, methyl cyclocitrone, methyl lavender ketone, orivone, para-tert-butyl cyclohexanone, Verdon, Delphone, muscone, neobutenone, plicatone, Veloutone, 2,4,4,7-tetramethyl oct-6-en-3-one, tetrameran or mixtures thereof. The ketones can preferably be selected from the damascones, carvone, gamma-methyl ionone, iso-E-Super, 2,4,4,7-tetramethyl oct-6-en-3-one, benzyl acetone, damascenone, methyl dihydrojasmonate, methyl cedrylone, hedione and mixtures thereof. All damascones and damascenones are most preferred. The stored ketones can be released under exposure to light, in particular encompassing wavelengths from 200 to 400 nm.

According to a preferred embodiment of the invention, in the ketone according to the invention of formula (I) the substituents R1 and R2, independently of one another, each denote a linear or branched, substituted or unsubstituted alkyl group having 1 to 6 C atoms, preferably 1 to 3 C atoms, in particular in each case a methyl residue,

R3, R6 and R7 each denote hydrogen, and the residues R4 and R5 each independently of one another denote hydrogen or a —CO—X group, where X═H, alkyl, cycloalkyl, aryl, acyl, OH, Oalkyl, NH₂, NH-alkyl, N(alkyl)₂ or halogen, at least one of residues R4 or R5 denoting the —CO—X group. Particularly preferred —CO—X groups are those in which X═H or —Oalkyl, such as in particular —OMe, and —OEt.

According to a further preferred embodiment of the invention, the pro-fragrance according to the invention is a ketone corresponding to formula (II) or (III)

wherein the residue R8 in each case denotes a hydrocarbon residue having at least 5 C atoms, which in particular encompasses a cyclic hydrocarbon residue, and wherein the residue X in each case denotes H, alkyl, cycloalkyl, aryl, acyl, OH, alkoxy, —NH₂, NH-alkyl, —N(alkyl)₂ or halogen. It is preferable for the residue X to denote H or an alkoxy group, in particular a methoxy or ethoxy group, and this in turn corresponds to a preferred embodiment of the invention.

According to a further preferred embodiment of the invention, ketones according to formulae (IV) to (XI) are preferred:

Said ketones of the aforementioned formulae (IV) to (XI) can be stably incorporated into the conventional washing or cleaning agent matrices, into cosmetics and into existing perfume compositions. They allow for a delayed release of the stored fragrances, namely in particular of damascone in the α, β, γ or δ form and of damascenone, in particular β-damascenone. Said ketones impart a particularly long-lasting freshness impression to conventional washing or cleaning agents and to cosmetics. The dried, laundered textile in particular benefits from the good long-term fresh fragrance effect. The particularly good attachment characteristics of said ketones to the target substrates, such as textiles in particular, are particularly advantageous. A very efficient deposition of the ketones on the target substrates can be achieved, particularly in the context of conventional textile laundering in commercial automatic washing machines, but also by hand washing.

According to a further preferred embodiment, such ketones within the meaning of the invention which correspond to said formulae (IV) to (XI) but in which, deviating from formulae (IV) to (XI), the substituents are arranged not in the 1,4-position on the benzene ring but in the 1,3-position, in other words analogously to the aforementioned formula (III), are advantageous.

The slow release of the stored perfume takes place following exposure to light (electromagnetic radiation), in particular encompassing wavelengths from 200 to 400 nm, as illustrated in simplified terms in the reaction equation below:

The present invention also provides a washing or cleaning agent, preferably a washing agent, fabric softener or washing auxiliary agent, comprising at least one ketone according to one of formulae (I) to (XI), wherein said ketone is preferably contained in amounts of between 0.0001 and 5 wt. %, advantageously between 0.001 and 4 wt. %, more advantageously between 0.01 and 3 wt. %, in particular between 0.1 and 2 wt. %, relative in each case to the total agent. Suitable cleaning agents are for example cleaning agents for hard surfaces, such as preferably dishwashing agents. They can likewise be cleaning agents such as for example household cleaners, general purpose cleaners, window cleaners, floor cleaners, etc. They can preferably be a product for cleaning lavatory pans and urinals, advantageously a toilet freshener to hang in the lavatory pan, in particular a toilet rim block.

According to a preferred embodiment of the invention the washing or cleaning agent according to the invention contains at least one surfactant selected from anionic, cationic, non-ionic, zwitterionic, amphoteric surfactants or mixtures thereof.

According to a further preferred embodiment of the invention the agent according to the invention is in solid or liquid form.

The invention also provides a cosmetic agent comprising at least one ketone according to one of formulae (I) to (XI), which cosmetic agent preferably contains said ketone in amounts of between 0.0001 and 5 wt. %, advantageously between 0.001 and 4 wt. %, more advantageously between 0.01 and 3 wt. %, in particular between 0.1 and 2 wt. %, relative in each case to the total agent.

The invention also provides an air care agent (e.g. room air freshener, room deodorizer, room spray, etc.) comprising at least one ketone according to one of formulae (I) to (XI), wherein said ketone is preferably contained in amounts of between 0.0001 and 50 wt. %, advantageously between 0.001 and 5 wt. %, more advantageously between 0.1 and 3 wt. %, in particular between 0.1 and 2 wt. %, relative in each case to the total agent.

According to a further preferred embodiment of the invention an agent according to the invention (i.e. washing or cleaning agent, cosmetic agent or air care agent), in particular washing or cleaning agent, additionally contains fragrances, advantageously in amounts of between 0.001 and 5 wt. %, selected in particular from the group encompassing fragrances of natural or synthetic origin, preferably more highly volatile fragrances, higher-boiling fragrances, solid fragrances and/or fixative fragrances.

Fixative perfumes, which can advantageously be used in the context of the present invention, are for example essential oils such as angelica root oil, aniseed oil, arnica flower oil, basil oil, bay oil, bergamot oil, champaca flower oil, noble fir oil, noble fir cone oil, elemi oil, eucalyptus oil, fennel oil, spruce needle oil, galbanum oil, geranium oil, gingergrass oil, guaiac wood oil, gurjun balsam oil, helichrysum oil, hon-sho oil, ginger oil, iris oil, cajeput oil, calamus oil, chamomile oil, camphor oil, cananga oil, cardamom oil, cassia oil, pine needle oil, copaiba balsam oil, coriander oil, spearmint oil, caraway oil, cumin oil, lavender oil, lemongrass oil, lime oil, mandarin oil, melissa oil, musk seed oil, myrrh oil, clove oil, neroli oil, niaouli oil, olibanum oil, orange oil, origanum oil, palmarosa oil, patchouli oil, Peru balsam oil, petitgrain oil, pepper oil, peppermint oil, pimento oil, pine oil, rose oil, rosemary oil, sandalwood oil, celery oil, spike lavender oil, star anise oil, turpentine oil, thuja oil, thyme oil, verbena oil, vetiver oil, juniper berry oil, wormwood oil, wintergreen oil, ylang-ylang oil, hyssop oil, cinnamon oil, cinnamon leaf oil, citronella oil, lemon oil and cypress oil.

However, higher-boiling or solid perfumes of natural or synthetic origin can also be used in the context of the present invention as fixative perfumes or perfume blends, i.e. as fragrances. These compounds include the compounds listed below and mixtures thereof: ambrettolide, α-amylcinnamaldehyde, anethol, anisaldehyde, anisic alcohol, anisol, methyl anthranilate, acetophenone, benzyl acetone, benzaldehyde, ethyl benzoate, benzophenone, benzyl alcohol, benzyl acetate, benzyl benzoate, benzyl formate, benzyl valerianate, borneol, bornyl acetate, α-bromostyrene, n-decyl aldehyde, n-dodecyl aldehyde, eugenol, eugenol methyl ether, eucalyptol, farnesol, fenchone, fenchyl acetate, geranyl acetate, geranyl formate, heliotropin, methyl heptine carboxylate, heptaldehyde, hydroquinone dimethyl ether, hydroxycinnamaldehyde, hydroxycinnamic alcohol, indole, irone, isoeugenol, isoeugenol methyl ether, isosafrole, jasmone, camphor, carvacrol, carvone, p-cresol methyl ether, coumarin, p-methoxyacetophenone, methyl-n-amyl ketone, methyl methyl anthranilate, p-methyl acetophenone, methyl chavicol, p-methyl quinoline, methyl-β-naphthyl ketone, methyl-n-nonyl acetaldehyde, methyl-n-nonyl ketone, muscone, β-naphthol ethyl ether, β-naphthol methyl ether, nerol, nitrobenzene, n-nonyl aldehyde, nonyl alcohol, n-octyl aldehyde, p-oxyacetophenone, pentadecanolide, β-phenyl ethyl alcohol, phenyl acetaldehyde dimethyl acetal, phenyl acetic acid, pulegone, safrole, isoamyl salicylate, methyl salicylate, hexyl salicylate, cyclohexyl salicylate, santalol, skatole, terpineol, thymene, thymol, γ-undelactone, vanillin, veratrum aldehyde, cinnamaldehyde, cinnamyl alcohol, cinnamic acid, ethyl cinnamate, benzyl cinnamate. The more highly volatile fragrances include in particular the lower-boiling perfumes of natural or synthetic origin, which can be used alone or in mixtures. Examples of more highly volatile fragrances are alkyl isothiocyanates (alkyl mustard oils), butanedione, limonene, linalool, linalyl acetate and propionate, menthol, menthone, methyl-n-heptenone, phellandrene, phenylacetaldehyde, terpinyl acetate, citral, citronellal.

According to a further preferred embodiment the agent according to the invention (i.e. washing or cleaning agent, cosmetic agent or air care agent), in particular washing or cleaning agent, has at least one, preferably a plurality of, active components, in particular active washing components, active care components, active cleaning components and/or cosmetic components, advantageously selected from the group encompassing anionic surfactants, cationic surfactants, amphoteric surfactants, non-ionic surfactants, acidifying agents, alkalizing agents, anti-crease compounds, antibacterial substances, antioxidants, anti-redeposition agents, antistatics, builder substances, bleaching agents, bleach activators, bleach stabilizers, bleach catalysts, ironing aids, cobuilders, fragrances, anti-shrink agents, electrolytes, enzymes, color protecting agents, coloring agents, dyes, dye transfer inhibitors, fluorescent agents, fungicides, germicides, odor-complexing substances, auxiliary agents, hydrotropes, rinse aids, complexing agents, preservatives, corrosion inhibitors, water-miscible organic solvents, optical brighteners, perfumes, perfume carriers, pearling agents, pH adjusters, phobing and impregnating agents, polymers, non-swelling agents, anti-slip agents, foam inhibitors, layered silicates, dirt-repellent substances, silver protection agents, silicone oils, soil release active agents, UV protective substances, viscosity regulators, thickening agents, discoloration inhibitors, graying inhibitors, vitamins and/or fabric softeners. Within the meaning of this invention, stated amounts for the agent according to the invention in wt. %, unless otherwise specified, relate to the total weight of the agent according to the invention.

The amounts of individual ingredients in the agents according to the invention (i.e. washing or cleaning agent, cosmetic agent or air care agent), in particular washing or cleaning agent, are guided in each case by the intended use of the agents in question, and the person skilled in the art is familiar in principle with the orders of magnitude of the amounts of ingredients to use or can obtain them from the associated specialist literature. Depending on the intended use of the agents according to the invention, a higher or lower surfactant content, for example, will be chosen. For example, the surfactant content of washing agents, for example, can conventionally be between 10 and 50 wt. %, preferably between 12.5 and 30 wt. % and in particular between 15 and 25 wt. %, whereas cleaning agents for automatic dishwashing, for example, can contain between 0.1 and 10 wt. %, preferably between 0.5 and 7.5 wt. % and in particular between 1 and 5 wt. % of surfactants.

The agents according to the invention (i.e. washing or cleaning agent, cosmetic agent or air care agent, but in particular washing or cleaning agent) can contain surfactants, with anionic surfactants, non-ionic surfactants and mixtures thereof, but also cationic surfactants, being preferably suitable. Suitable non-ionic surfactants are in particular ethoxylation and/or propoxylation products of alkyl glycosides and/or linear or branched alcohols each having 12 to 18 C atoms in the alkyl part and 3 to 20, preferably 4 to 10, alkyl ether groups. Corresponding ethoxylation and/or propoxylation products of N-alkylamines, vicinal diols, fatty acid esters and fatty acid amides, which in terms of the alkyl part correspond to the cited long-chain alcohol derivatives, and of alkyl phenols having 5 to 12 C atoms in the alkyl residue can also be used.

Suitable anionic surfactants are in particular soaps and examples containing sulfate or sulfonate groups, with preferably alkali ions as cations. Soaps which can be used are preferably the alkali salts of saturated or unsaturated fatty acids having 12 to 18 C atoms. Such fatty acids can also be used in not completely neutralized form. Suitable surfactants of the sulfate type include the salts of sulfuric acid semi-esters of fatty alcohols having 12 to 18 C atoms and the sulfation products of said non-ionic surfactants with a low degree of ethoxylation. Suitable surfactants of the sulfonate type include linear alkylbenzene sulfonates having 9 to 14 C atoms in the alkyl part, alkane sulfonates having 12 to 18 C atoms, and olefin sulfonates having 12 to 18 C atoms which are formed in the reaction of corresponding monoolefins with sulfur trioxide, as well as alpha-sulfo fatty acid esters which are formed in the sulfonation of fatty acid methyl or ethyl esters.

Cationic surfactants are preferably selected from the esterquats and/or the quaternary ammonium compounds according to the general formula (R^(I))(R^(II))(R^(III))(R^(IV))N⁺X⁻, in which R^(I) to R^(IV) denote identical or different C₁₋₂₂ alkyl residues, C₇₋₂₈ arylalkyl residues or heterocyclic residues, wherein two or in the case of an aromatic bonding as in pyridine even three residues together with the nitrogen atom form the heterocycle, for example a pyridinium or imidazolinium compound, and X⁻ denotes halide ions, sulfate ions, hydroxide ions or similar anions. Quaternary ammonium compounds can be produced by reacting tertiary amines with alkylating agents, such as for example methyl chloride, benzyl chloride, dimethyl sulfate, dodecyl bromide, but also ethylene oxide. The alkylation of tertiary amines having one long alkyl residue and two methyl groups is achieved particularly easily; in addition, the quaternization of tertiary amines having two long residues and one methyl group can be performed under gentle conditions with the aid of methyl chloride. Amines having three long alkyl residues or hydroxy-substituted alkyl residues are not very reactive and are quaternized with dimethyl sulfate, for example. Suitable quaternary ammonium compounds are for example benzalkonium chloride (N-alkyl-N,N-dimethyl benzylammonium chloride), benzalkon B (m,p-dichlorobenzyldimethyl-C₁₂-alkylammonium chloride, benzoxonium chloride (benzyldodecyl bis-(2-hydroxyethyl)ammonium chloride), cetrimonium bromide (N-hexadecyl-N,N-trimethylammonium bromide), benzetonium chloride (N,N-dimethyl-N-[2-[2-[p-(1,1,3,3-tetramethylbutyl)phenoxy]ethoxy]ethyl]benzylammonium chloride), dialkyldimethylammonium chlorides such as di-n-decyldimethylammonium chloride, didecyldimethylammonium bromide, dioctyldimethylammonium chloride, 1-cetylpyridinium chloride and thiazoline iodide and mixtures thereof. Preferred quaternary ammonium compounds are benzalkonium chlorides having C₈-C₂₂ alkyl residues, in particular C₁₂-C₁₄ alkylbenzyldimethylammonium chloride.

Preferred esterquats are methyl-N-(2-hydroxyethyl)-N,N-di(tallow acyloxyethyl)ammonium methosulfate, bis-(palmitoyl)ethyl hydroxyethyl methylammonium methosulfate or methyl-N,N-bis(acyloxyethyl)-N-(2-hydroxyethyl)ammonium methosulfate.

Surfactants are contained in the agents according to the invention (i.e. washing or cleaning agent, cosmetic agent or air care agent, but in particular washing or cleaning agent) in quantitative proportions of preferably 5 wt. % to 50 wt. %, in particular 8 wt. % to 30 wt. %. In laundry post-treatment agents in particular, up to 30 wt. % of surfactants are preferably used, in particular 5 wt. % to 15 wt. %, preferably including at least a proportion of cationic surfactants.

An agent according to the invention, in particular washing or cleaning agent, preferably contains at least one water-soluble and/or water-insoluble, organic and/or inorganic builder. The water-soluble organic builder substances include polycarboxylic acids, in particular citric acid and sugar acids, monomeric and polymeric aminopolycarboxylic acids, in particular methylglycine diacetic acid, nitrilotriacetic acid and ethylenediamine tetraacetic acid as well as polyaspartic acid, polyphosphonic acids, in particular amino tris(methylene phosphonic acid), ethylenediamine tetrakis(methylene phosphonic acid) and 1 hydroxyethane-1,1-diphosphonic acid, polymeric hydroxy compounds such as dextrin as well as polymeric (poly)carboxylic acids, polymeric acrylic acids, methacrylic acids, maleic acids and mixed polymers thereof, which can also contain small amounts of polymerizable substances without carboxylic acid functionality incorporated by polymerization. The relative molecular mass of the homopolymers of unsaturated carboxylic acids is generally between 5,000 and 200,000, that of the copolymers between 2000 and 200,000, preferably 50,000 to 120,000, relative in each case to free acid. A particularly preferred acrylic acid-maleic acid copolymer has a relative molecular mass of 50,000 to 100,000. Suitable, albeit less preferred, compounds of this class are copolymers of acrylic acid or methacrylic acid with vinyl ethers, such as vinyl methyl ethers, vinyl esters, ethylene, propylene and styrene, in which the proportion of acid is at least 50 wt. %. For the production of liquid agents in particular, the organic builder substances can be used in the form of aqueous solutions, preferably in the form of 30 to 50 wt. % aqueous solutions. All the cited acids are generally used in the form of their water-soluble salts, in particular their alkali salts.

Organic builder substances can be included if desired in amounts of up to 40 wt. %, in particular up to 25 wt. % and preferably from 1 wt. % to 8 wt. %. Amounts close to the cited upper limit are preferably used in paste-form or liquid, in particular water-containing, agents according to the invention. Laundry post-treatment agents according to the invention, such as fabric softeners for example, can optionally also be free from organic builders.

Suitable water-soluble inorganic builder materials include in particular alkali silicates and polyphosphates, preferably sodium triphosphate. Crystalline or amorphous alkali aluminosilicates in particular can be used as water-insoluble, water-dispersible inorganic builder materials, if desired in amounts of up to 50 wt. %, preferably not over 40 wt. % and in liquid agents in particular in amounts of 1 wt. % to 5 wt. %. Of these the crystalline sodium aluminosilicates in washing agent grade, in particular Zeolite A, P and optionally X, are preferred. Amounts close to the cited upper limit are preferably used in solid, particulate agents. Suitable aluminosilicates have in particular no particles with a particle size of more than 30 μm and preferably consist of at least 80 wt. % of particles with a size of less than 10 μm. It is, however, particularly preferable to avoid the use of water-insoluble builder materials, to a very great extent at least, such that they are preferably used, if at all, in only small amounts, for example in amounts of <5 wt. % or <1 wt. %, relative to the total agent.

Suitable substitutes or partial substitutes for said aluminosilicate are crystalline alkali silicates, which can be present alone or mixed with amorphous silicates. The alkali silicates that can be used as builders in the agents according to the invention preferably have a molar ratio of alkali oxide to SiO₂ of less than 0.95, in particular from 1:1.1 to 1:12, and can be amorphous or crystalline. Preferred alkali silicates are the sodium silicates, in particular the amorphous sodium silicates, with a molar ratio of Na₂O: SiO₂ of 1:2 to 1:2.8. Crystalline layered silicates of the general formula Na₂Si_(x)O_(2x+1).yH₂O are preferably used as crystalline silicates, which can be present alone or mixed with amorphous silicates, in which x, the modulus, is a number from 1.9 to 4 and y is a number from 0 to 20, and preferred values for x are 2, 3 or 4. Preferred crystalline layered silicates are those in which x assumes the values 2 or 3 in the cited general formula. In particular both β- and δ-sodium disilicates (Na₂Si₂O₅.yH₂O) are preferred. Virtually anhydrous crystalline alkali silicates of the aforementioned general formula prepared from amorphous alkali silicates, in which x denotes a number from 1.9 to 2.1, can also be used in agents according to the invention. In a further preferred embodiment of agents according to the invention a crystalline sodium layered silicate with a modulus of 2 to 3 is used, such as can be prepared from sand and soda. Crystalline sodium silicates with a modulus in the range from 1.9 to 3.5 are used in a further preferred embodiment of agents according to the invention. If alkali aluminosilicate, in particular zeolite, is also present as an additional builder substance, the weight ratio of aluminosilicate to silicate, relative in each case to anhydrous active substances, is preferably 1:10 to 10:1. In agents containing both amorphous and crystalline alkali silicates, the weight ratio of amorphous alkali silicate to crystalline alkali silicate is preferably 1:2 to 2:1 and in particular 1:1 to 2:1.

If desired, builder substances are preferably contained in the agents according to the invention, in particular washing or cleaning agents, in amounts of up to 60 wt. %, in particular 5 wt. % to 40 wt. %. Laundry post-treatment agents according to the invention, such as fabric softeners for example, are preferably free from inorganic builders.

Suitable peroxygen compounds are in particular organic peracids or peracid salts of organic acids, such as phthalimidoperhexanoic acid, perbenzoic acid or salts of diperdodecanedioic acid, hydrogen peroxide and inorganic salts which give off hydrogen peroxide under the application conditions, such as perborate, percarbonate and/or persilicate. If solid peroxygen compounds are to be used, they can be used in the form of powders or granules, which can also be coated in a manner known in principle. Alkali percarbonate, alkali perborate monohydrate or, in liquid agents in particular, hydrogen peroxide in the form of aqueous solutions containing 3 wt. % to 10 wt. % of hydrogen peroxide are particularly preferably optionally used. If an agent according to the invention contains bleaching agents, such as preferably peroxygen compounds, these are present in amounts of preferably up to 50 wt. %, in particular from 5 wt. % to 30 wt. %. The addition of small amounts of known bleaching agent stabilizers such as for example phosphonates, borates or metaborates and metasilicates as well as magnesium salts such as magnesium sulfate can be useful.

Compounds which under perhydrolysis conditions yield aliphatic peroxocarboxylic acids having preferably 1 to 10 C atoms, in particular 2 to 4 C atoms, and/or optionally substituted perbenzoic acid can be used as bleach activators. Substances bearing O and/or N acyl groups of the cited C atomic number and/or optionally substituted benzoyl groups are suitable. Polyacylated alkylene diamines, in particular tetraacetyl ethylenediamine (TAED), acylated triazine derivatives, in particular 1,5-diacetyl-2,4-dioxohexahydro-1,3,5-triazine (DADHT), acylated glycolurils, in particular tetraacetyl glycoluril (TAGU), N-acylimides, in particular N-nonanoyl succinimide (NOSI), acylated phenol sulfonates, in particular n-nonanoyl or isononanoyl oxybenzene sulfonate (n- or iso-NOBS), carboxylic anhydrides, in particular phthalic anhydride, acylated polyhydric alcohols, in particular triacetin, ethylene glycol diacetate, 2,5-diacetoxy-2,5-dihydrofuran and enol esters, as well as acetylated sorbitol and mannitol or mixtures thereof (SORMAN), acylated sugar derivatives, in particular pentaacetyl glucose (PAG), pentaacetyl fructose, tetraacetyl xylose and octaacetyl lactose, as well as acetylated, optionally N-alkylated glucamine and gluconolactone, and/or N-acylated lactams, for example N-benzoyl caprolactam, are preferred.

Hydrophilically substituted acyl acetals and acyl lactams are likewise preferably used. Combinations of conventional bleach activators can also be used. Such bleach activators can be included in the conventional range of amounts, preferably in amounts from 1 wt. % to 10 wt. %, in particular 2 wt. % to 8 wt. %, relative to the total agent.

Sulfonimines and/or bleach-reinforcing transition metal salts or transition metal complexes can also be included as so-called bleach catalysts in addition to the aforementioned conventional bleach activators or in their place.

Suitable enzymes for use in the agents include those from the class of proteases, cutinases, amylases, pullulanases, hemicellulases, cellulases, lipases, oxidases and peroxidases as well as mixtures thereof. Enzymatic active ingredients obtained from fungi or bacteria, such as Bacillus subtilis, Bacillus licheniformis, Streptomyces griseus, Humicola lanuginosa, Humicola insolens, Pseudomonas pseudoalcaligenes or Pseudomonas cepacia, are particularly suitable. The optionally used enzymes can be adsorbed on supporting materials and/or embedded in coating substances to protect them against premature inactivation. If desired, they are preferably contained in the agents according to the invention in amounts not exceeding 5 wt. %, in particular 0.2 wt. % to 2 wt. %.

As optical brighteners the agents can optionally contain for example derivatives of diaminostilbene disulfonic acid or alkali metal salts thereof. Salts of 4,4′-bis(2-anilino-4-morpholino-1,3,5-triazinyl-6-amino)stilbene-2,2′-disulfonic acid or similarly structured compounds bearing a diethanolamino group, a methylamino group, an anilino group or a 2-methoxyethylamino group in place of the morpholino group, are suitable for example.

Suitable foam inhibitors include for example organopolysiloxanes and mixtures thereof with microfine, optionally silanized silicic acid and paraffin waxes and mixtures thereof with silanized silicic acid or bis-fatty acid alkylene diamides. Mixtures of various foam inhibitors are also used to advantage, for example those comprising silicones, paraffins or waxes. The foam inhibitors, in particular silicone- and/or paraffin-containing foam inhibitors, are preferably bound to a granular, water-soluble or water-dispersible carrier substance. Mixtures of paraffin waxes and bistearyl ethylenediamides are preferred in particular.

In addition, the agents can also contain components known as soil release agents, which positively influence the ability to wash oils and fats out of textiles. This effect becomes particularly apparent if a textile that has previously been washed multiple times with an agent according to the invention containing said oil and fat releasing component is soiled. The preferred oil and fat releasing components include for example non-ionic cellulose ethers such as methyl cellulose and methyl hydroxypropyl cellulose containing from 15 to 30 wt. % of methoxyl groups and from 1 to 15 wt. % of hydroxypropoxyl groups, relative in each case to the non-ionic cellulose ether, and the polymers of phthalic acid and/or terephthalic acid or derivatives thereof with monomeric and/or polymeric diols, in particular polymers of ethylene terephthalates and/or polyethylene glycol terephthalates or anionically and/or non-ionically modified derivatives thereof, known from the prior art.

The agents can also contain dye transfer inhibitors, preferably in amounts from 0.1 wt. % to 2 wt. %, in particular 0.1 wt. % to 1 wt. %, which in a preferred embodiment of the invention are polymers of vinyl pyrrolidone, vinyl imidazole, vinyl pyridine-N-oxide or copolymers thereof.

Graying inhibitors have the task of holding the dirt released from the textile fibers suspended in the liquor. Water-soluble colloids, mostly of an organic nature, are suitable for this purpose, for example starch, glue, gelatin, salts of ether carboxylic acids or ether sulfonic acids of starch or cellulose or salts of acid sulfuric acid esters of cellulose or starch. Water-soluble polyamides containing acid groups are also suitable for this purpose. Starch derivatives other than those mentioned above can also be used, for example aldehyde starches. Cellulose ethers such as carboxymethyl cellulose (Na salt), methyl cellulose, hydroxyalkyl cellulose and mixed ethers, such as methylhydroxyethyl cellulose, methylhydroxypropyl cellulose, methylcarboxymethyl cellulose and mixtures thereof can preferably be used, for example in amounts of 0.1 to 5 wt. %, relative to the agents.

The organic solvents that can be used in the agents according to the invention, particularly if they are in liquid or paste form, include alcohols having 1 to 4 C atoms, in particular methanol, ethanol, isopropanol and tert-butanol, diols having 2 to 4 C atoms, in particular ethylene glycol and propylene glycol, and mixtures thereof and the ethers derivable from said classes of compounds. Such water-miscible solvents are preferably present in the agents according to the invention in amounts not exceeding 30 wt. %, in particular 6 wt. % to 20 wt. %.

To set a desired pH that is not established automatically by mixing the other components, the agents according to the invention can contain system-compatible and environmentally compatible acids, in particular citric acid, acetic acid, tartaric acid, malic acid, lactic acid, glycolic acid, succinic acid, glutaric acid and/or adipic acid, but also mineral acids, in particular sulfuric acid, or bases, in particular ammonium or alkali hydroxides. Such pH adjusters are optionally included in the agents according to the invention in amounts preferably not exceeding 20 wt. %, in particular 1.2 wt. % to 17 wt. %.

The production of solid agents according to the invention (i.e. in particular washing or cleaning agents) presents no difficulties and can be performed in principle in a known manner, for example by spray drying or granulation, with optional peroxygen compound and optional bleach catalyst optionally being added at a later stage. A method involving an extrusion step is preferred for the production of agents according to the invention having an elevated bulk density, in particular in the range from 650 g/l to 950 g/l. The production of liquid agents according to the invention likewise presents no difficulties and can likewise be performed in a known manner.

The production of the ketones according to the invention is described in the example section by way of example by reference to the production of a pro-fragrance containing δ-damascone. The other ketones of the general formula (I) and in particular all ketones of formulae (VI) to (XI) are also obtainable via this standard synthesis route.

According to a preferred embodiment the teaching according to the invention can be used to significantly reduce the perfume content in washing, cleaning and personal care agents. In this way it is possible also to offer perfumed products for particularly sensitive consumers who because of specific intolerances and irritations can use normally perfumed products only to a limited extent if at all.

In addition to the ketone according to the invention, a preferred solid, in particular powdered, washing agent according to the invention can also contain in particular components selected for example from the following:

-   -   Anionic surfactants, such as preferably alkyl benzene sulfonate,         alkyl sulfate, for example in amounts of preferably 5 to 30 wt.         %,     -   Non-ionic surfactants, such as preferably fatty alcohol         polyglycol ether, alkyl polyglucoside, fatty acid glucamide, for         example in amounts of preferably 0.5 to 15 wt. %,     -   Builders, such as for example zeolite, polycarboxylate, sodium         citrate, in amounts of for example 0 to 70 wt. %, advantageously         5 to 60 wt. %, preferably 10 to 55 wt. %, in particular 15 to 40         wt. %,     -   Alkalis, such as for example sodium carbonate, in amounts of for         example 0 to 35 wt. %, advantageously 1 to 30 wt. %, preferably         2 to 25 wt. %, in particular 5 to 20 wt. %,     -   Bleaching agents, such as for example sodium perborate, sodium         percarbonate, in amounts of for example 0 to 30 wt. %,         advantageously 5 to 25 wt. %, preferably 10 to 20 wt. %,     -   Corrosion inhibitors, for example sodium silicate, in amounts of         for example 0 to 10 wt. %, advantageously 1 to 6 wt. %,         preferably 2 to 5 wt. %, in particular 3 to 4 wt. %,     -   Stabilizers, for example phosphonates, advantageously 0 to 1 wt.         %,     -   Foam inhibitor, for example soap, silicone oils, paraffins,         advantageously 0 to 4 wt. %, preferably 0.1 to 3 wt. %, in         particular 0.2 to 1 wt. %,     -   Enzymes, for example proteases, amylases, cellulases, lipases,         advantageously 0 to 2 wt. %, preferably 0.2 to 1 wt. %, in         particular 0.3 to 0.8 wt. %,     -   Graying inhibitor, for example carboxymethyl cellulose,         advantageously 0 to 1 wt. %,     -   Discoloration inhibitor, for example polyvinyl pyrrolidone         derivatives, preferably 0 to 2 wt. %,     -   Adjusters, for example sodium sulfate, advantageously 0 to 20         wt. %,     -   Optical brighteners, for example stilbene derivative, biphenyl         derivative, advantageously 0 to 0.4 wt. %, in particular 0.1 to         0.3 wt. %,     -   Optionally further fragrances,     -   Optionally water,     -   Optionally soap,     -   Optionally bleach activators,     -   Optionally cellulose derivatives,     -   Optionally dirt repellents,         percentages by weight relative in each case to the total agent.

In another preferred embodiment of the invention the agent is in liquid form, preferably in gel form. Preferred liquid washing or cleaning agents and cosmetics have water contents of for example 10 to 95 wt. %, preferably 20 to 80 wt. % and in particular 30 to 70 wt. %, relative to the total agent. In the case of liquid concentrates the water content can also be particularly low, for example <30 wt. %, preferably <20 wt. %, in particular <15 wt. %, percentages by weight relative in each case to the total agent. The liquid agents can also contain non-aqueous solvents.

In addition to the ketone according to the invention, a preferred liquid, in particular gel-form, washing agent according to the invention can also contain in particular components selected for example from the following:

-   -   Anionic surfactants, such as preferably alkyl benzene sulfonate,         alkyl sulfate, for example in amounts of preferably 5 to 40 wt.         %,     -   Non-ionic surfactants, such as preferably fatty alcohol         polyglycol ether, alkyl polyglucoside, fatty acid glucamide, for         example in amounts of preferably 0.5 to 25 wt. %,     -   Builders, such as for example zeolite, polycarboxylate, sodium         citrate, advantageously 0 to 15 wt. %, preferably 0.01 to 10 wt.         %, in particular 0.1 to 5 wt. %,     -   Foam inhibitor, for example soap, silicone oils, paraffins, in         amounts of for example 0 to 10 wt. %, advantageously 0.1 to 4         wt. %, preferably 0.2 to 2 wt. %, in particular 1 to 3 wt. %,     -   Enzymes, for example proteases, amylases, cellulases, lipases,         in amounts of for example 0 to 3 wt. %, advantageously 0.1 to 2         wt. %, preferably 0.2 to 1 wt. %, in particular 0.3 to 0.8 wt.         %,     -   Optical brighteners, for example stilbene derivative, biphenyl         derivative, in amounts of for example 0 to 1 wt. %,         advantageously 0.1 to 0.3 wt. %, in particular 0.1 to 0.4 wt. %,     -   Optionally further fragrances,     -   Optionally stabilizers,     -   Water     -   Optionally soap, in amounts of for example 0 to 25 wt. %,         advantageously 1 to 20 wt. %, preferably 2 to 15 wt. %, in         particular 5 to 10 wt. %,     -   Optionally solvents (preferably alcohols), advantageously 0 to         25 wt. %, preferably 1 to 20 wt. %, in particular 2 to 15 wt. %,         percentages by weight relative in each case to the total agent.

In addition to the ketone according to the invention, a preferred liquid fabric softener according to the invention can also contain in particular components selected from the following:

-   -   Cationic surfactants, such as in particular esterquats, for         example in amounts of 5 to 30 wt. %,     -   Co-surfactants, such as for example glycerol monostearate,         stearic acid, fatty alcohols, fatty alcohol ethoxylates, for         example in amounts of 0 to 5 wt. %, preferably 0.1 to 4 wt. %,     -   Emulsifiers, such as for example fatty amine ethoxylates, for         example in amounts of 0 to 4 wt. %, preferably 0.1 to 3 wt. %,     -   Optionally further fragrances,     -   Dyes, preferably in the ppm range,     -   Stabilizers, preferably in the ppm range,     -   Solvents such as for example water, in amounts of preferably 60         to 90 wt. %, percentages by weight relative in each case to the         total agent.

The invention also provides a method for the lasting fragrancing of surfaces, wherein a ketone according to one of formulae (I) to (XI) or a washing or cleaning agent according to the invention is applied to the surface to be fragranced (e.g. textile, crockery, floor) and said surface is then exposed to electromagnetic radiation, in particular encompassing wavelengths from 200 to 400 nm.

The invention also provides a method for lasting room fragrancing, wherein an air care agent according to the invention is exposed to electromagnetic radiation, in particular encompassing wavelengths from 200 to 400 nm.

EXAMPLE

Representation of a ketone of general formula (I):

5.5 mmol of n-butyl lithium in hexane were added dropwise to a solution of 0.5 g of diisopropylamine in 12 ml of absolute tetrahydrofuran at −78° C. within 5 minutes. 1.03 g (5 mmol) of ethyl-4-propionyl benzoate in 13 ml of absolute tetrahydrofuran were added dropwise. After stirring for 1 h at −78° C., 2.2 g (6 mmol) of cerium(III) chloride dried under high vacuum in 15 ml of absolute tetrahydrofuran were added and the mixture was stirred for a further 30 min. Still at −78° C., 1.15 g of δ-damascone were then added within 10 min and stirred for a further 1 h. Then the temperature was raised to room temperature within 6 h and the mixture was processed: first of all approx. 15 ml of saturated ammonium chloride solution were added slowly. Then the mixture was extracted three times, with 25 ml of diethyl ether each time, and the combined organic phases were washed with saturated sodium chloride solution until neutral. The crude product was purified by column chromatography (petroleum ether:ethyl acetate=95:5) and yielded ethyl-4-(2,3-dimethyl-5-oxo-5-(2,6,6-trimethylcyclohex-3-enyl)pentanoyl)benzoate. 0.84 g of the target product were obtained as a colorless oil.

The ketone produced in this way had a very good fragrancing effect when used in washing agents and fabric softeners in textile treatment. In particular, the fragrance impression on the laundry washed therewith and then dried was found to have a much better persistence as compared with washing agents and fabric softeners containing an equivalent amount of δ-damascone but of an otherwise identical composition. The fresh fragrance impression of the textiles lasted significantly longer, both after line drying and in particular after drying in an automatic dryer. In the conventional application, i.e. when used in a washing agent or fabric softener and in a machine washing application, the pro-fragrance used attached very efficiently to the textiles, and significantly better than the otherwise comparable pro-fragrance without —CO—OEt substitution.

While at least one exemplary embodiment has been presented in the foregoing detailed description of the invention, it should be appreciated that a vast number of variations exist. It should also be appreciated that the exemplary embodiment or exemplary embodiments are only examples, and are not intended to limit the scope, applicability, or configuration of the invention in any way. Rather, the foregoing detailed description will provide those skilled in the art with a convenient road map for implementing an exemplary embodiment of the invention, it being understood that various changes may be made in the function and arrangement of elements described in an exemplary embodiment without departing from the scope of the invention as set forth in the appended claims and their legal equivalents. 

What is claimed is:
 1. A ketone of the general formula (I),

wherein R denotes a substituted hydrocarbon residue having at least one C═O group, R1, R2 each independently of one another denote hydrogen, an aryl residue, a linear or branched, substituted or unsubstituted alkoxy group having 1 to 15 C atoms, a linear or branched, substituted or unsubstituted alkyl group having 1 to 15 C atoms or a substituted or unsubstituted aryl residue, R3, R4, R5, R6 and R7 each independently of one another denote hydrogen, an amino group, —NO2, a linear or branched, substituted or unsubstituted alkoxy group having 1 to 15 C atoms, a linear or branched, substituted or unsubstituted alkyl group having 1 to 15 C atoms, a cycloalkyl residue, acyl residue, aryl residue, —OH, —NH₂, halogen, NH alkyl or —N(alkyl)₂, and wherein at least one of the residues R3, R4, R5, R6, R7 denotes a —CO—X group, where X═H, alkyl, cycloalkyl, aryl, acyl, —OH, —Oalkyl, NH₂, NH-alkyl, —N(alkyl)₂ or halogen.
 2. The ketone according to claim 1, wherein the substituents R1 and R2, independently of one another, denote a linear or branched, substituted or unsubstituted alkyl group having 1 to 6 C atoms, preferably 1 to 3 C atoms, in particular in each case a methyl residue, wherein R3, R6 and R7 each denote hydrogen, wherein the residues R4 and R5 each independently of one another denote hydrogen or a —CO—X group, where X═H, alkyl, cycloalkyl, aryl, acyl, —OH, —Oalkyl, —NH₂, NH-alkyl, —N(alkyl)₂ or halogen, and wherein at least one of residues R4 or R5 denoting the —CO—X group.
 3. The ketone according to claim 1, selected from the group consisting of ketones corresponding to formula (II) or (III)

wherein the residue R8 in each case denotes an optionally substituted hydrocarbon residue having at least 5 C atoms, wherein the residue X in each case denotes H, alkyl, cycloalkyl, aryl, acyl, —OH, —Oalkyl, —NH₂, NH-alkyl, —N(alkyl)₂ or halogen.
 4. The ketone according to claim 3, wherein the residue X denotes H or an —Oalkyl group.
 5. A washing or cleaning agent comprising at least one ketone according to claim 1, wherein said ketone is contained in amounts of between 0.0001 and 5 wt. %, relative to the total agent.
 6. The washing or cleaning agent according to claim 5, wherein it contains at least one surfactant selected from the group consisting of anionic, cationic, non-ionic, zwitterionic, amphoteric surfactants or mixtures thereof.
 7. The washing or cleaning agent according to claim 5, wherein it is in solid or liquid form.
 8. A cosmetic agent comprising at least one ketone according to claim 1, wherein said ketone is contained in amounts of between 0.0001 and 50 wt. %, relative to the total agent.
 9. A method for the lasting fragrancing of surfaces, wherein a ketone according to claim 1 is applied to the surface to be fragranced and said surface is then exposed to electromagnetic radiation. 